a-a a-b a-c aaa aab aac aah aan aao aar aav ab- aba abb abc abh abn abo abr abv ac- aca acb acc ach acn aco acr acv aha ahb ahc ahh ahn aho ahr ahv an- ana anb anc anh ann ano anr anv aoa aob aoc aoh aon aoo aor aov ar- ara arb arc arh arn aro arr arv av- ava avb avc avh avn avo avr baa bab bac bah ban bao bar bav bba bbb bbc bbh bbn bbo bbr bca bcb bcc bch bcn bco bcr bcv bha bhb bhc bhh bho bhr bhv bna bnb bnc bnn bno bnr bnv boa bob boc boh bon boo bor bov bra brb brh brn bro brr brv bva bvb bvc bvh bvn bvo bvr bvv c-- caa cab cac cah can cao car cav cba cbb cbc cbh cbn cbo cbr cbv cca ccb ccc cch ccn cco ccr ccv ch- cha chb chc chh chn cho chr chv cn- cna cnb cnc cnh cnn cno cnr cnv co- coa cob coc coh con coo cor cov cra crb crc crh crn cro crr crv cva cvb cvc cvh cvn cvo cvr cvv haa hab hac hah han hao har hav hba hbb hbc hbh hbn hbo hbr hbv hca hcb hcc hch hcn hco hcr hcv hha hhb hhc hhh hhn hho hhr hhv hna hnb hnc hnh hnn hno hnv hoa hob hoc hoh hon hoo hor hov hr- hra hrb hrc hrh hrn hro hrr hrv hv- hva hvb hvc hvn hvo hvr hvv naa nab nac nah nan nao nar nav nba nbb nbc nbn nbo nbr nbv nca ncb ncc nch ncn nco ncr ncv nha nhb nhc nhh nhn nhr nhv nna nnb nnc nnh nnn nno nnv no- noa nob noc noh non noo nor nov nra nrb nrc nrn nro nrr nrv nva nvb nvc nvh nvn nvv oaa oab oac oah oan oao oar oav ob- oba obb obc obh obn obo obr obv oc- oca ocb occ och ocn oco ocr ocv oha ohc ohh ohn oho ohr on- ona onb onc onh onn ono onr oo- ooa oob ooc ooh oon ooo oor oov or- ora orb orc orh orn oro orr orv ov- ova ovb ovc ovh ovo ovv ra- raa rab rac rah ran rao rar rav rba rbb rbc rbh rbn rbo rbr rca rcb rcc rch rcn rco rcr rcv rh- rha rhb rhc rhh rhn rho rhr rhv rna rnb rnc rnh rnn rno rnr rnv roa rob roc roh ron roo ror rov rra rrb rrc rrh rrn rrr rva rvb rvc rvh rvn rvo rvr rvv v-a vaa vab vac vah van vao var vav vba vbc vbh vbo vbr vbv vca vcc vch vcn vco vcr vh- vha vhb vhc vho vn- vna vno vnr vnv voa vob voc voh von voo vor vov vra vrb vrc vrh vrn vrr vva vvb vvc vvo vvr vvv